GB979436A - Detergent compositions and method of preparation - Google Patents

Abstract

A stable, solid, chlorinated caustic product containing up to 18% available chlorine is prepared by contacting a solid reaction mixture containing sodium hydroxide and at least one hygroscopic material selected from complex sodium phosphate and sodium metasilicate, the weight ratio of sodium hydroxide to hygroscopic material being 1 to 9:1, with a gas stream containing sufficient chlorine to initiate an exothermic reaction and subsequently maintaining the temperature at 110 DEG -140 DEG F. until the available chlorine content of the solid reaction mixture is 8 to 18%. The reaction temperature is then increased to 135 DEG -160 DEG F. for a reaction period of at least 10 minutes, but insufficient to decrease the available chlorine content of the solid reaction mixture by more than 2%. Detergent compositions and machine dishwashing compositions can be prepared containing at least 0.5% and 0.5 to 8% by weight respectively of the above chlorinated product (see Division C5).ALSO:Detergent compositions and machine dishwashing compositions contain at least 0.5% by weight of a solid detonated caustic product containing up to 18% available chlorine, prepared by reacting a mixture of caustic soda and either complex sodium phosphate or sodium metasilicate with chlorine (see Division C1) A detergent composition comprises by weight 10-60% sodium polyphosphate, 0-50% sodium carbonate, 0-50% sodium metasilicate, 0-50% trisodium phosphate and 3-75% of the chlorinated caustic product. A machine dishwashing composition comprises 10-60% sodium tripolyphosphate, 0-50% sodium carbonate, 0-50% sodium metasilicate, 0-50% trisodium phosphate, 1-5% low foaming polyalkenoxy type nonionic surfactant and 10-50% of the chlorinated caustic product.